no. Bitter ends are on the trampoline. You're splicing the small 1/8" (or similar) line in the center of the spinnaker sheet. It goes through the weave of the sheet and then around itself.

Bitter ends are eye spliced and connected with a tiny little locking spliced strop (I have this now and it's cool).

The F18 we just acquired has this setup. I haven't yet looked closely at how the 1/8" line is connected to the sheet. I'll have the boat rigged this weekend and try to get some photos.